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According to the PHP manual, you're right. I just need to know why it works for me without the change. Could you check what version of the PCRE library is compiled in your PHP version? Just create a PHP Info page by putting the following code in a page and visiting it, and look for "PCRE Library Version":

According to the PCRE changelog (http://www.pcre.org/changelog.txt), the syntax we use is only compatible with PCRE 7.0 and up. Before that version, only the syntax you suggest is valid. I'll update the code.